// 基础类型
var userName = "李敏";
var message = "Hello,".concat(userName);
var isBool = false;
var age = 18;
var u = undefined;
var n = null;
// 赋值any(任意类型)
var any = null;
any = "sewsd";
any = true;
any = undefined;
any.myName;
any.getName();
